Which network scanner is used to identify hosts and open ports for security assessment?

Which network scanner is used to identify hosts and open ports for security assessment?

• A. nmap
• B. ping
• C. netstat
• D. tracert

Answer: (A)

Identifying which devices are present on a network and which ports they have open is essential for understanding the system’s exposure to potential threats. A network scanner like Nmap is designed for this purpose: it probes hosts to determine which are up and which ports are listening, often revealing the services running on those ports and sometimes even the operating systems in use. This lets you map active devices and their exposed services, which is the first step in assessing security risk and planning mitigation. Ping only checks whether a host is reachable; it doesn’t reveal any open ports or services. Netstat shows open sockets on the local machine you’re using, not on other devices in the network. Tracert shows the route packets take to a destination, not the port status on remote hosts. So the tool that directly serves the goal of discovering both hosts and open ports across a network is Nmap.

Identifying which devices are present on a network and which ports they have open is essential for understanding the system’s exposure to potential threats. A network scanner like Nmap is designed for this purpose: it probes hosts to determine which are up and which ports are listening, often revealing the services running on those ports and sometimes even the operating systems in use. This lets you map active devices and their exposed services, which is the first step in assessing security risk and planning mitigation.

Ping only checks whether a host is reachable; it doesn’t reveal any open ports or services. Netstat shows open sockets on the local machine you’re using, not on other devices in the network. Tracert shows the route packets take to a destination, not the port status on remote hosts. So the tool that directly serves the goal of discovering both hosts and open ports across a network is Nmap.